president bashar assad's government denies the use of chemical weapons. the obama administration asked the u.n. to investigate. >>> despite an apology, bradley manning will spend 35 years in prison for leaking thousands of top secret documents. cbs reporter tara mergener has more on what happened today. >> reporter: bradley manning showed no emotion as the military judge announced his punishment. the former army intelligence analyst was sentenced to 35 years in prison. he will be dishonorably discharged and forfeit all pay and benefits. manning was convicted of 20 offenses for giving more than 700,000 secret documents to wikileaks including diplomatic cables and this 2007 video from a gunship in baghdad when civilians were killed. last week, a apologized saying, i understand that i must pay a price for my decisions and actions and he apologized. his lawyers argued for a lesser sentence saying their client was under severe emotional distress. >> manning was a low level analyst when he leaked the information. he says he did it to provoke public debate about